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Question
If A = `[("a", "b"),("c", "d")]` then find the value of |A|−1
Solution
|A| = `|("a", "b"),("c", "d")|`
= ad – bc
∴ |A|−1 = `1/("ad" - "bc")` .......`[∵ |"A"^-1| = 1/|"A"|]`
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